A hose and nozzle discharge a horizontal water jet against a nearby vertical plate. The flow of rate of water is 0.025 m3/s and the diameter of the nozzle tip is 30 mm. Find the horizontal force necessary to hold the plate in place.
Solution:
The inlet diameter of a venture meter is 31 mmØ while that of the throat is 19mm. If the pressure at the inlet of the venture meter is 750 kPa and that of the throat is 550 kPa, find the discharge through the venture meter, neglecting any losses.
Solution:
The ratio of mass of solids to the total volume is known as
a) dry density
b) dry unit weight
c) specific weight
d) specific gravity
A concrete spillway with permanent crest elevation at 75m. controls a reservoir having an area of 5 hectares. The length of the spillway is 12.9m. How long will it take for the water to be drawn from elevation 76.5m. to elevation 75.5m. if the flash boards are removed? C = 1.84.
Solution:
The processed used in water treatment to remove dissolved metals such as zinc, copper, lead, etc.
a) filtration
b) Soda Ash
c) zeolite
d) aeration
Answer:
Tow reservoirs having a difference in elevation of 82 ft. is connected by a 3 inch diam. pipe, 2500 feet long with a roughness coefficient n = 0.012. After 10 years, the roughness coefficient n = 0.0265. Find the percentage change in discharge.
Solution:
A cylindrical tank is filled with water. If the diameter of the orifice at the bottom of the tank has a diameter of 30mm, find the discharge through the orifice if the height of water above the orifice is 1 m. deep.
Solution:
Tow reservoirs having a difference in elevation of 82 ft. is connected by a 3 inch diam. pipe, 2500 feet long with a roughness coefficient n = 0.012. After 10 years, the roughness coefficient n = 0.0265. Find the percentage change in discharge.
Solution:
Determine the discharge of a suppressed rectangular weir if H = 0.81m. L = 3m. and Cw = 0.62
Solution:
A manometer is attached to a tank containing three different fluids shown in the figure. What will be the difference in elevation of the mercury column in the manometer.
Solution:
What length of a Cipolletti weir should be constructed in order that the head of flow will be 0.91 m. when the rate of flow is 3.45 m3/s?
Solution:
Figure shown shows a typical cross section near the center of a gravity dam. Find the vertical component of the resultant force analyzing block B1 for stability. Assume the reservoir is empty.
Solution:
A rectangular dam having a width of 14.8 m. has a height of 23.2 m. The depth of water on one side of the dam is 20.4m. If the coefficient of friction between the dam and the foundation is 0.85, compute for the factor of safety for sliding if the density of concrete is 2310 kg/m3.
Solution:
Compute the total stress at a point 5m. below the ground surface represented by the accompanying figure. The upper 2m. layer has a bulk unit weight of 14 kN/m3 and that of the second layer is 16 kN/m3. The water table is located 3m. below the ground surface.
Solution:
A soil sample having a mass of 3.75 kg has a volume of 0.0015 m3. If the water content is 28% and specific gravity of 2.71, compute the void ratio.
Solution:
A soil sample having a mass of 6.4 kg has a volume of 0.0052 m3. If the water content is 24% and specific gravity of 2.66, compute the degree of saturation.
Solution:
The water content of a soft clay is 54.2 percent and the liquid limit is 56 percent. Estimate the compression index.
Solution:
The depth of water outside the cofferdam as shown in the figure is 10ft. and the penetration of the sheet piles below the original surface of the sand is 18ft. The water level in the ditch is 20 ft. below the outside water level. If K = 5×10-3 cm/sec. find the seepage into the ditch per foot length of the entire cofferdam in liters/sec.
Solution:
A specimen of saturated and was subjected to a consolidated-undrained triaxial test. The result of which are as follows.
Chamber confining pressure is 80 kPa
Deviator stress = 120 kPa
Pore water pressure = 30 kPa
Compute the drained angle of friction.
Solution:
A rectangular channel has a width of 5 ft. that carries a discharge of 227 cfs. If the value of n = 0.012, find the critical velocity.
Solution:
Find the slope of a 10ft. wide rectangular channel having n = 0.012 that makes critical flow occur at a depth of 10 feet.
Solution:
A semi-circular canal carries a discharge of 1.13 m3/s with a velocity of 1.4 m/s. Compute the slope of the canal if n = 0.012.
Solution:
A trapezoidal conduit has a bottom width of 6m. and a side angle of 35°. Determine the water depth when it has a slope of 0.000512 and a discharge of 40 m3/sec. n = 0.014
Solution:
In a liquid limit test, using a cone penetrometer, the following readings were recorded and tabulated as shown. Determine the plasticity index of the soil.
Plastic Limit Test
| TRIAL | δ wet | δ dry |
| 1 | 128.6 | 105.4 |
| 2 | 141.4 | 116.8 |
| 3 | 132.6 | 109.6 |
| 4 | 134.5 | 11.2 |
| 5 | 136.0 | 113.4 |
Solution:
Find the discharge of a Cipolletti weir if it has a length of 2m. and a head of 0.8 ft.
Solution:
A laboratory procedure in testing soil where in a spatula is used which consists of a brass cup and hard rubber base. The brass cup can be dropped onto the base by a cam operated by a crank. In order to form this test, a soil paste is placed in the cup. A groove is cut at the center of the soil pat with the standard grooving tool. Then, by the use of crank operated cam, the cup is lifted and dropped from a height of 10mm. The moisture content in percent required to close a distance of 12.7mm along the bottom of the groove after 25blows gives us the value of this test.
a) liquid limit
b) plastic limit
c) shrinkage limit
d) atterberg limits
Answer:
Ratio of volume of voids to the total volume.
a) void ratio
b) porosity
c) degree of saturation
d) specific gravity
Answer:
A field compacted sample of sandy loam was found to have a wet density of 136 pcf. At a water content of 10 percent. The maximum dry density of the soil obtained in a Standard Proctor Test was 125 pcf. Assuming specific gravity Gs to be 2.65, compute the percent compaction of the field sample.
Solution:
A sample of uniform sand has a porosity of 43% and water content of 12%. Assume Gs =2.65. emin = 0.50, emax = 0.85. Compute the dry unit weight.
Solution:
Find the length of a Cipolletti weir if it has a discharge of 1.2 m3/s and the length of the weir in 5 times of its head.
Solution:
A water tank with diameter 2m. is filled with water. If the water level is 3m. above a nozzle, how far would the water have traveled if the nozzle is 10m. above the ground.
Solution:
A spillway 2m. deep goes over a dam 40 m. high If Cw = 3.2, determine the discharge?
Solution:
Oil with a specific gravity of 0.80 is 0.91 m. deep in an open tank which is otherwise filled with water. If the tank is 3.05 m. deep, what is the pressure at the bottom of the tank?
Solution:
A gate 2m. high and 4m. wide is flush with water at the top. Determine the moment at the bottom.
Solution:
Gate AB in figure is semi-circular which is hinged at B. What horizontal force is required at A for equilibrium?
Solution:
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